[Rtk-users] CUDA 3D texture memory management

[MORY, CYRIL]

Hi everyone,

I'm converting a filter I've designed into CUDA, and I'm new to CUDA. The filter takes in input a 4d image (3D +time), interpolates between two instants (two 3D images taken from the 4D image by selecting a given instant) to obtain a 3D image, and forward projects through this 3D image. I already have an interpolation kernel that works, it uses global memory to store both the 4D image and the interpolated 3D image (there probably is a better way, but I'll optimize that later). For the forward projection, I'd like to reuse as much as possible the rtkCudaForwardProjectionImageFilter code, but :

-          rtkCudaForwardProjectionImageFilter stores its input 3D volume into a 3D texture

-          texture memory, I think, is read-only for threads

-          So I can't fill in the 3D texture during interpolation
I think I need to work with global memory during interpolation to generate the 3D volume, then somehow copy the result to a 3D texture, and use the existing (maybe slightly modified) forward projection function to get the projection.

My problem is in the "somehow"... Do I need to actually copy the data from the global memory to the texture memory ? Or is it enough to bind it to a texture ? Does anyone have an example somewhere ?

Regards,
==========================================
Cyril Mory
PhD student at Philips Medisys and CREATIS

Groupement Hospitalier Est
Hôpital Cardiologique Louis Pradel
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